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M3.5 earthquake 4 km ESE of Uki, Kumamoto, Japan

A magnitude 3.5 earthquake struck 4 km ESE of Uki, Kumamoto, Japan at 01:39 local time (16:39 UTC) on 22 Sept 2026, at a depth of 0 km, according to JMA. The solution is preliminary and may be revised.

Data: JMA · updated 2026-09-21 16:43 UTC · automatic solution

Magnitude
3.5minor
JMA magnitude (Mj)
Depth
0 km
Status
Automatic
Origin time
2026-09-21 16:39:00 UTC
Local: 22 Sept 2026, 01:39:00 (Asia/Tokyo)
Epicentre
32.600° N, 130.700° E

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
UkiKumamoto, Japan · pop. 59,9284 kmVModerate
WakasuKumamoto, Japan · pop. 11,0946 kmVModerate
MatsubaseKumamoto, Japan · pop. 26,1636 kmVModerate
UtoKumamoto, Japan · pop. 37,4429 kmIVLight
HonmachiKumamoto, Japan · pop. 123,06715 kmIIIWeak
KotōKumamoto, Japan · pop. 543,73021 kmIIIWeak
KumamotoJapan · pop. 738,90723 kmIIIWeak
NagasakiJapan · pop. 409,11879 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more. Likely felt out to about 26 km.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses JMA.

AgencyMagnitudeDepthEpicentreTime offsetStatus
JMAheadlineJMA via Japan Meteorological Agency3.5 Mj0 km32.60° N, 130.70° E–Automatic

How big was it?

Often felt by people at rest close to the epicentre, rarely causes damage.

It released roughly the energy of 2.7 t of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 0 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M3.5 releases about 32× the energy of M2.5, and its waves are about 10× taller on a seismogram. Energy: 2.7 t of TNT vs 85 kg of TNT.

Each square is the energy of one M2.5. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

10 later earthquakes within 30 km; the largest was M4.5 2 days ago. 12 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M3.5

10 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
6.803.010
31.803.310
68.983.010
69.122.710
87.422.00
104.874.510
105.072.910
105.703.610
114.052.60
148.832.810
  1. 4.55 km NNE of Shimada, Kumamoto, Japan09-26 01:31
  2. 3.65 km NNE of Shimada, Kumamoto, Japan09-26 02:21
  3. 3.34 km NE of Uto, Kumamoto, Japan09-23 00:27
  4. 3.0Near Honmachi, Kumamoto, Japan09-21 23:27
  5. 3.0Near Honmachi, Kumamoto, Japan09-24 13:38
  6. 2.95 km NNE of Shimada, Kumamoto, Japan09-26 01:43
  7. 2.89 km W of Honmachi, Kumamoto, Japan09-27 21:29
  8. 2.74 km NE of Uto, Kumamoto, Japan09-24 13:46
  9. 2.6Near Honmachi, Kumamoto, Japan09-26 10:42
  10. 2.04 km ESE of Uki, Kumamoto, Japan09-25 08:04

Did you feel it?

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How strong was the shaking where you were?

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Reports on SeismoAtlas

No reports yet.

Event id jma20260922013910. First recorded here 28 Sept 2026, 17:32:05 UTC. Solutions: JMA (jma:20260922013910). Cite as: SeismoAtlas, “M3.5 earthquake 4 km ESE of Uki, Kumamoto, Japan”, https://seismoatlas.com/earthquake/jma20260922013910-m3-5-earthquake-4-km-ese-of-uki-kumamoto-japan, data from JMA.

JSON: /api/v1/events/jma20260922013910. SeismoAtlas is not an official warning service.